24-70 L choice shallow DOF

This may have been answered elsewhere and I should know the answer... All things being equal, a mage i taken by the two lenses (24-70 f2.8 and 24-70 f4) on the same subject, the same body, same settings, both wide open, another different shutter speed, a stop will be the images appear similar (identical)?
In my humble OPINION, the f4 IS must balance the difference of single window shutter. I forgot something?
Is there a mathematical difference in depth of field based on the max aperture?

SonomaBear wrote:
Thank you Scotty... an old man can learn something new.
I always thought that the DOF was zero to max aperture rather than a slight difference based on the max. So a first 1.4 will be had a little less DOF than a 1.8 all things being equal.
Since I shoot so many portraits to 85 mm, maybe I'll get the f1.8 EF85 instead of using a variable aperture zoom.
I went to http://www.dofmaster.com/dofjs.html for the info.

Yes.  If you are looking for really thin DOF, then get a quick first on the zoom.  1.8 is much thinner than 2.8.  Even more than the difference between 2.8 and 4.  Once you go under 2.8 - ish be really careful to exactly where you are focusing.

The 85mm 1.8 is an excellent choice for portraits.

Tags: Canon Camera

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